(a)why are gold & platinum called noble metal ?
(b) The purity of gold is expressed in terms of carat. What does a carat means?
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a)= Platinum and gold are called noble metals because of stability and do not react with other metals. Both resist oxidation and corrosion. Gold and Platinum jewelry always remains on high demand.....
b)= Karat, also spelled Carat, a measure of the fineness (i.e., purity) of gold. ... Thus, an object that contains 16 parts gold and 8 parts alloying metal is 16-karat gold, and pure gold is 24-karat gold. This system of indicating the relative proportion of gold originated with a medieval coin called a mark.....
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Answer:
a) Gold and Platinum are called noble metals because they don't react with other metals and they have stability
b) Carat is the measure of purity of gold
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